Sparking plug



S. E. TAYLOR, F O. ELLIS, AND G. E. T. ARCHER. SPARKING PLUG.

APPLICATION FlLEDJUNE 15,l920.

L41 6,U?m t ted May 23, 1922 6.501865 6 7T wil :5 w:

SYDNEY nnnnsr TAYLOR, or wnsrcmsn-oiv-sna, r'nnnzenron omvnn ELLIS, or sonrnnnn, AND onozasn EDWIN recites anonnn, or LEIGH, ENG-LAND;

srainrrno PLUG.

Application filed June 15, 1920.

ment in Edparking Plugs, ofwhich the fol-.

. lowing is a soecification.

This invention of improvements in sparking plugs for internal combustion engines has for its object the construction a plug capable of ready and easy detachment from and attachment to the cylinder, without the aid of tools, and in addition consists of a minimum of parts which can be quickly dismantled for inspection, cleaning and so forth.

And in order that the said invention may be clearly understood. reference is directed to the following description and accompanying sheet of drawings, wherein Figure l represents part vertical section of the hereinafter described inner member according to a practical embodiment of the invention.

Figure 2 is a similar view of the hereinafterdescrilnzd outer shell or adapter.

Figure 3 is a reverse plan of the member seen in Figure l, partly in section and,

Figure 4 is a plan. view of the member seen i in Figure 2.

Like letters of reference indicate corresponding parts in the views.

l'n carrying out the invention and with reference to the embodiment thereof as illus trated, we employ an outer shell or adapter a, see Figures 2 and 1-, which is of cylindrical formation with hexagonal or other exterior faces 72, and a reduced portion 0, exteriorly threaded, for insertion in the usual threaded aperture of a cylinder or the like. Said shell is formed with three or other number of inward projections (Z (secured thereto or formed therewith). An inner member or body portion, seen in Figures l and 3, is provided which has a cylindrical boss 6 adapted to closely fit the shell a aforesaid. Said boss 6 has a number of rightangular or other bayonet slots 7 corresponding to the pins cl of the shell member aforesaid, so that by inserting the body and giving a partial turn, the said body is longitudinally locked in Specification of Letters Patent.

Serial No. 389,204.

position. The two arms inclined obtusely.

The said body member is hollow and has a reduced neck g, furnished with the usual earth electrode or electrodes h, and is interiorly threaded at its upper portion 2' to recelve plug proper j of any convenient design and indicated by dotted lines in Figure 1. The boreic of the, interior of the body portion 6 between the thread and the 11 duced portion. 9 may be tapered as illustrated to accommodate a tapered portion of the insulation of the plug proper. The plug proper may thus screw into the body aforesaid. ate' and its central electrode Z extends into the reduced portion g of the shell.

The upper part of the body 6 is furnished with a comparatively wide annular flange m preferably of insulating material both as regards current and heat, said flange being for the purpose of operating and handling the body 6. To this end the flange is knurled or milled on its outer periphery as seen in Figure 1.

To provide against accidental rotation of the body e within the shell a, due to vibra tion or other causes, any suitable catch device may be employed. As one form of catch, we may employ a slidable or pivoted lever or plate on the undersurface of the handlingflange, said lever or plate terminating in a right-angular or other catch which can lie (when pressed in) in a continuation of the bayonet groove, or in a recess specially provided for the purpose. Said catch, however, is normally pressed outwards by a spring or'other means. A form of such a catch is illustrated in Figures 1 and 3 of the accompanying drawings, and is hereinafter described.

When the body portion 6 is inserted in the shell a, the catch is pressed out of the way, and released when the joint is efl'ected. The right-angular or other catch then springs into engagement with the inner wall of the shell, which is serrated, recessed, notched, or otherwise prepared, as seen at a (an enlargement of an eflective form of serration being shown in Figure 2) to receive the said catch.

As one form of a catch adapted to be constructed as a metal stamping and as illustrated, the plate 0 is pivoted at p to the undersurface of the flange m aforesaid and lies fiat thereagainst. It has a right-angular roughened thumb-piece g lying nearly against of the slot f may be Patented May 23, T922.

i the periphery of the milled face or flange m, and is furnished on its opposite edge with piece 9 is gripped with and pressed against the milled edge, and the locking action is as above described. The operating part 9 may extend through the disc m as a plunger, actuating the catch 1".

WVe claim 2- 1; A. spark plug including an attaching shell having a threaded nipple portion for engaging With the threaded opening in the motor and also having a socket provided at its upper edge With an interior annular locking portion, a plug carrying body adapted to be inserted in the socket, means for locking the plug in the socket against axial displacement,and a device mounted on the plug carrying body and having engagement with the interior locking portion of said shell.

2 A spark plug including a shell having a threaded attaching nipple portion and a socket having a locking portion, a plug carrying body adapted to lit in said socket, an offset annular manipulating flange carried by the body, means whereby the plug carrying body and shell may be locked against axial displacement, and a catch device carried by said manipulating flange and having a part projecting into the socket of the shell and adapted to engage with said locking portion of the socket.

3. A spark plug including a shell having threaded attaching nipple portion and an interior socket, a plug carrying body adapted to it in said socket and having a manipulating flange, and catch means for holding the said plug carrying body in the shell consisting of a shiftable lever carried by the underside of said flange of the body member. said lever terminating in a keeper portion for engaging in a recess in the bottom men! her, and a spring for norn'ially pressing said catch member in a direction to engage the inner wall of the said shell.

In testimony whereof we have aflixed our 5 signatures hereto this 21st day of \lay 192M.

SYDNEY ERNEST TAYLOR.

FREDERICK OLIVER ELLIS.

GEORGE EDWIN THOMAS ARCHER.

till 

